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arXiv · 1507.08431

Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate

Qingyan Wang·Wenhao Zhang·Zuocheng Zhang·Yi Sun·Ying Xing·Yayu Wang·Lili Wang·Xucun Ma·Qi-Kun Xue·Jian Wang
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Abstract

Interface-enhanced high-temperature superconductivity in one unit-cell (UC) FeSe film on SrTiO3(001) (STO) substrate has recently attracted much attention in condensed matter physics and material science. Here, by ex situ transport measurements, we report on the superconductivity in FeSe ultra-thin films with different thickness on STO substrate. We find that the onset superconducting transition temperature (Tc) decreases with increasing film thickness of FeSe, which is opposite to the behavior usually observed in traditional superconductor films. By systematic post-annealing of 5 UC FeSe films, we observe an insulator to superconductor transition, which is accompanied with a sign change of the dominated charge carriers from holes to electrons at low temperatures according to the corresponding Hall measurement.

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Qingyan Wang, Wenhao Zhang, Zuocheng Zhang, Yi Sun, Ying Xing, Yayu Wang, Lili Wang, Xucun Ma, Qi-Kun Xue, Jian Wang. 2015-07-30. Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate. https://doi.org/10.1088/2053-1583%2F2%2F4%2F044012

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